What happens when you opt out of the “voluntary” pornoscanners at Berlin’s Schönefeld airport

Yesterday morning, Matthias Kirschner opted out of the “voluntary” full-body scanners at Berlin’s Schönefeld, and discovered that “voluntary” means that “if you don’t do it, they will barrack you endlessly about your choice, punitively repeatedly perform the same searches over and over, and attempt to delay you so you almost miss your flight.”